/* -*- C++ -*-
 * lemon/lp_skeleton.h - Part of LEMON, a generic C++ optimization library
 *
 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 * (Egervary Research Group on Combinatorial Optimization, EGRES).
 *
 * Permission to use, modify and distribute this software is granted
 * provided that this copyright notice appears in all copies. For
 * precise terms see the accompanying LICENSE file.
 *
 * This software is provided "AS IS" with no warranty of any kind,
 * express or implied, and with no claim as to its suitability for any
 * purpose.
 *
 */

#ifndef LEMON_LP_SKELETON
#define LEMON_LP_SKELETON

#include <lemon/lp_base.h>

///\file
///\brief A skeleton file to implement LP solver interfaces
namespace lemon {
  
  ///A skeleton class to implement LP solver interfaces
  class LpSkeleton :public LpSolverBase {
    int col_num,row_num;
    
  protected:
    ///\e
    virtual LpSolverBase &_newLp();
    ///\e
    virtual LpSolverBase &_copyLp();
    /// \e
    virtual int _addCol();
    /// \e
    virtual int _addRow();
    /// \e
    virtual void _eraseCol(int i);
    /// \e
    virtual void _eraseRow(int i);
    /// \e

    /// \warning Arrays are indexed from 1 (datum at index 0 is ignored)
    ///
    virtual void _setRowCoeffs(int i, 
			       int length,
                               int  const * indices, 
                               Value  const * values );
    /// \e

    /// \warning Arrays are indexed from 1 (datum at index 0 is ignored)
    ///
    virtual void _setColCoeffs(int i, 
			       int length,
                               int  const * indices, 
                               Value  const * values );
    
    /// Set one element of the coefficient matrix
    virtual void _setCoeff(int row, int col, Value value);

    /// The lower bound of a variable (column) have to be given by an 
    /// extended number of type Value, i.e. a finite number of type 
    /// Value or -\ref INF.
    virtual void _setColLowerBound(int i, Value value);
    /// \e

    /// The upper bound of a variable (column) have to be given by an 
    /// extended number of type Value, i.e. a finite number of type 
    /// Value or \ref INF.
    virtual void _setColUpperBound(int i, Value value);
    /// \e

//     /// The lower bound of a linear expression (row) have to be given by an 
//     /// extended number of type Value, i.e. a finite number of type 
//     /// Value or -\ref INF.
//     virtual void _setRowLowerBound(int i, Value value);
//     /// \e

//     /// The upper bound of a linear expression (row) have to be given by an 
//     /// extended number of type Value, i.e. a finite number of type 
//     /// Value or \ref INF.
//     virtual void _setRowUpperBound(int i, Value value);

    /// The lower and upper bound of a linear expression (row) have to be 
    /// given by an 
    /// extended number of type Value, i.e. a finite number of type 
    /// Value or +/-\ref INF.
    virtual void _setRowBounds(int i, Value lb, Value ub);
    /// \e


    /// \e
    virtual void _clearObj();
    /// \e
    virtual void _setObjCoeff(int i, Value obj_coef);

    ///\e
    
    ///\bug Wrong interface
    ///
    virtual SolveExitStatus _solve();

    ///\e

    ///\bug Wrong interface
    ///
    virtual Value _getPrimal(int i);
    ///\e

    ///\bug Wrong interface
    ///
    virtual Value _getPrimalValue();
    ///\e

    ///\bug Wrong interface
    ///
    virtual SolutionStatus _getPrimalStatus();

    ////e
    virtual SolutionStatus _getDualStatus();


    ///\e
    virtual ProblemTypes _getProblemType();

    ///\e
    virtual void _setMax();
    ///\e
    virtual void _setMin();
    

  public:
    LpSkeleton() : LpSolverBase(), col_num(0), row_num(0) {}
  };  

} //namespace lemon

#endif // LEMON_LP_SKELETON